OBD-II FAULT CODE
P0311
Cylinder 11 Misfire Detected
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P0311.
- Check Engine light, rough idle, hesitation, flashing MIL if severe
- Worn spark plug
- Faulty ignition coil
- Injector or fuel issue
- Vacuum leak
- Low compression
- Scan all modules and record freeze-frame data before clearing codes
- Check battery voltage and related fuses
- Identify affected cylinder(s), inspect plugs/coils, check fuel trims and compression if needed
- Swap-test coil/injector where practical, replace worn ignition parts, repair vacuum/fuel/compression cause
Related Codes
Need more help?
Search manuals, wiring diagrams and technical service bulletins.
Not sure what to do next?
Get step-by-step instructions and professional repair information.
Disclaimer: Information is provided for general guidance only and may not apply to all vehicles. Always consult a qualified technician.